Accession Number : AD0667544

Title :   PHOTOEMISSION AND OPTICAL STUDIES OF COBALT, PALLADIUM, PLATINUM, AND GADOLINIUM.

Descriptive Note : Technical rept.,

Corporate Author : STANFORD UNIV CALIF STANFORD ELECTRONICS LABS

Personal Author(s) : Yu,Albert Yeou-Cherng

Report Date : MAY 1967

Pagination or Media Count : 203

Abstract : Photoemission and optical reflectivity measurements on cobalt, palladium, platinum, and gadolinium have been made to determine the major features of their electronic structures. Nondirect transitions predominate the optical transitions in all of these materials; however, direct transitions (or nondirect transitions with varying matrix element) are also observed in palladium and platinum. The optical density of states of cobalt is found to be very similar to that of nickel and iron, despite the fact that all three metals have different crystal structures. They all have a strong peak at about 5 eV below the fermi level. No such peak is present in the optical densities of states of palladium and platinum at this energy, though the latter has a strong peak at about 7 eV below the fermi level. The optical density of states of palladium and platinum all have strong peaks right below the fermi level, in reasonable agreement with the findings based on specific heat and magnetic susceptibility data. The noble metals, copper, silver, and gold, also have strong peaks near the top of the d states. The optical density of states of gadolinium is found to be in reasonable agreement with the calculated density of states for -4 eV = or < E - E sub f = or < 0.

Descriptors :   (*TRANSITION METALS, OPTICAL PROPERTIES), (*RARE EARTH ELEMENTS, OPTICAL PROPERTIES), BAND THEORY OF SOLIDS, COBALT, PALLADIUM, PLATINUM, GADOLINIUM, FILMS, ANOMALIES, EXCITATION, WORK FUNCTIONS, PHOTOELECTRIC EFFECT, REFLECTIVITY, COBALT ALLOYS, PLATINUM ALLOYS, PALLADIUM ALLOYS, COPPER ALLOYS, SOLID STATE PHYSICS

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE